Road marker



FIG. 1 is a front perspective view of a road marker showing my new design, the center portion being in its normally upraised position;

FIG. 2 is a perspective view thereof showing the center portion in its depressed position;

FIG. 3 is a front elevational view thereof, the rear being identical;

FIG. 4 is a side elevational view thereof;

FIG. 5 is a top plan view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a road marker, as shown and described. 